#!/usr/bin/env coffee

> @w5/uridir
  @w5/read
  @w5/write
  fs > existsSync
  path > join dirname

ROOT = dirname uridir(import.meta)
main = =>
  index = read join ROOT,'index.js'
  if ~ index.indexOf('import.meta.url')
    return

  li = index.replace(
    /module\.exports\..*/g,''
  ).trimEnd().split('\n')

  for i,pos in li
    if i.startsWith 'const {'
      p = i.indexOf('require(')
      if p > 0
        i = i.trimEnd()
        li[pos] = 'import '+i.slice(6,-1).replace(/\s*=\s*/g,' from ').replace('require(','')

  li = li.join('\n')
  p = li.lastIndexOf('const ')
  if p > 0
    t = li.slice(p)
    li = li.slice(0,p)
    p = t.lastIndexOf('}')
    end = t.slice(p)
    export_li = t.slice(t.indexOf('{')+1,p).split(',').map((i)=>i.trim())

  out = '''import { createRequire } from "module";
  import { dirname, sep } from "path";
  const __dirname = dirname(decodeURIComponent(import.meta.url.slice(sep=='/'? 7:8)));
  const require = createRequire(import.meta.url);''' +li

  patch_fp = join ROOT, 'patch.js'

  if existsSync patch_fp
    patch = read(patch_fp)
    out += ';\n'+patch
  else
    patch = ''

  if export_li
    for i from export_li
      out+='\nexport const '+i+' = nativeBinding.'+i+';'

  write(
    join ROOT,'index.js'
    out
  )
  return

main()